SMD switch and touchpad module and computing device using same

ABSTRACT

A surface mount device switch includes a pedestal, a flexible conducting element and a metal dome. The flexible conducting element is connected with the pedestal. There is a spacing distance between the flexible conducting element and a circuit board. The metal dome is located under a pedestal conducting part of the pedestal and the flexible conducting element. When the flexible conducting element is pushed by the metal dome, the flexible conducting element is deformable in the direction toward the circuit board. Since the collision between the metal dome and the flexible conducting element is alleviated, the noise is reduced. Consequently, the comfort of operating the touchpad module is enhanced. The present invention further provides a touchpad module and a computing device with the surface mount device switch.

FIELD OF THE INVENTION

The present invention relates to an input device, and more particularlyto an input device with a touch control function.

BACKGROUND OF THE INVENTION

With increasing development of science and technology, a variety ofelectronic devices are designed in views of convenience anduser-friendliness. For helping the user well operate the electronicdevices, the electronic devices are gradually developed in views ofhumanization. The common electronic devices include for example notebookcomputers, mobile phones, satellite navigation devices, or the like.Recently, the storage capacity and the processor's computing performancefor these electronic devices are largely enhanced, and thus theirfunctions become more powerful and complicated. For efficientlyoperating an electronic device, a touchpad is used as an input device ofthe electronic device for controlling the operations of the electronicdevice.

FIG. 1 schematically illustrates a conventional notebook computer with atouchpad module. As shown in FIG. 1, the touchpad module 1 is installedon a casing 21 of the notebook computer 2. Moreover, at least a portionof the touchpad module 1 is exposed outside so as to be touched by theuser's finger. Consequently, the user may operate the touchpad module 1to control the notebook computer 2. For example, in case that the user'sfinger is placed on the touchpad module 1 and slid on the touchpadmodule 1, a cursor 23 shown on a display screen 22 of the notebookcomputer 2 is correspondingly moved. Moreover, in case that the touchpadmodule 1 is pressed down by the user's finger, the notebook computer 2executes a specified function. The use of the touchpad module 1 canimplement some functions of the conventional mouse. In other words, theuser may operate the notebook computer 2 through the touchpad module 1without the need of additionally carrying or installing the mouse.

FIG. 2 is a schematic cross-sectional view illustrating the touchpadmodule as shown in FIG. 1, in which the touchpad module is not presseddown. FIG. 3 is a schematic cross-sectional view illustrating thetouchpad module as shown in FIG. 1, in which the touchpad module ispressed down. FIG. 4 is a schematic cross-sectional view illustratingportions of a circuit board and a switch element of the touchpad moduleas shown in FIG. 1. As shown in FIGS. 2, 3 and 4, a fixing frame 24 isconcavely formed in the casing 21 of the notebook computer 2. Asupporting structure 241 and a triggering part 242 are respectivelyprotruded from two opposite sides of an inner wall of the fixing frame24. A first end 11 of the touchpad module 1 is connected with thesupporting structure 241. Consequently, a second end 12 of the touchpadmodule 1 may be swung relative to the triggering part 242 by using thesupporting structure 241 as a fulcrum.

The touchpad module 1 further comprises a switch element 13 and acircuit board 14. The switch element 13 is located under the second end12 of the touchpad module 1 and aligned with the triggering part 242.The switch element 13 comprises a metal dome 131. A first conductingpart 141 and a second conducting part 142 corresponding to the metaldome 131 are disposed on the circuit board 14. The first conducting part141 and the second conducting part 142 are separated from each other bya gap. When the touchpad module 1 is not pressed down, the metal dome131 is not subjected to deformation. Meanwhile, as shown in FIG. 4, themetal dome 131 is contacted with the first conducting part 141 but notcontacted with the second conducting part 142.

While the touchpad module 1 is pressed down by the user, the second end12 of the touchpad module 1 is swung downwardly relative to thetriggering part 242 by using the supporting structure 241 as a fulcrum.When the switch element 13 of the touchpad module 1 is pushed by thetriggering part 242 of the fixing frame 24, the metal dome 131 issubjected to deformation. At the same time, the metal dome 131 iscontacted with both of the first conducting part 141 and the secondconducting part 142, and the electric connection between the firstconducting part 141 and the second conducting part 142 is established.Under this circumstance, the switch element 13 is triggered to generatea switch signal to the notebook computer 2. According to the switchsignal, the notebook computer 2 executes a corresponding function. Whenthe touchpad module 1 is no longer pressed by the user, the second end12 of the touchpad module 1 is swung upwardly relative to the triggeringpart 242 in response to the elastic force of the metal dome 131 and/orthe elastic force of the supporting structure 241. Consequently, themetal dome 131 is restored to its original shape (see FIG. 4) and thetouchpad module 1 is returned to its original position.

However, the conventional touchpad module 1 still has some drawbacks.For example, while the touchpad module 1 is pressed down by the user,unpleasant noise is generated. The source of the noise includes theclick sound in response to the collision between the switch element 13and the triggering part 242 and the click sound in response to thecollision between the deformed metal dome 131 and the second conductingpart 142. For solving this problem, some other touchpad modules havebeen disclosed. In accordance with a conventional touchpad module, arubber element (not shown) is disposed on the triggering part 242 toalleviate the collision between the switch element 13 and the triggeringpart 242. In accordance with another conventional touchpad module, arubber cover is sheathed around the switch element 13. Due to the rubbercover, the click sound inside the touchpad module is blocked from beingoutputted from the touchpad module. However, regardless of whether therubber element is installed on the triggering part 242 or the rubbercover is sheathed around the switch element 13, the efficacy of reducingthe noise is limited. In other words, the touchpad module needs to befurther improved.

SUMMARY OF THE INVENTION

A first object of the present invention provides a surface mount device(SMD) switch. The SMD switch includes a pedestal and a flexibleconducting element. The flexible conducting element is deformablerelative to the pedestal in a direction toward a circuit board of atouchpad module. Since the click sound is alleviated when the SMD switchis triggered, the comfort of operating the touchpad module is enhanced.

A second object of the present invention provides a touchpad module withthe SMD switch.

A third object of the present invention provides a computing device withthe touchpad module.

In accordance with an aspect of the present invention, there is provideda surface mount device switch for a touchpad module with a circuitboard. The surface mount device switch includes a pedestal, a flexibleconducting element and a metal dome. The pedestal includes a pedestalconducting part and at least one pedestal contact part. The pedestalconducting part is electrically connected with the at least one pedestalcontact part. The at least one pedestal contact part is electricallyconnected with the circuit board. The flexible conducting element isconnected with the pedestal and electrically connected with the at leastone pedestal contact part. The flexible conducting element is notcontacted with the pedestal conducting part. When the at least onepedestal contact part is electrically connected with the circuit board,the flexible conducting element and the circuit board are separated fromeach other by a spacing distance. The metal dome is located under thepedestal conducting part and the flexible conducting element. When thesurface mount device switch pushes a triggering part, the metal dome issubjected to deformation and contacted with the pedestal conducting partand the flexible conducting element, so that the pedestal conductingpart and the flexible conducting element are electrically connected witheach other. As the flexible conducting element is contacted with andpushed by the metal dome, the flexible conducting element is deformablein a direction toward the circuit board to generate an elastic force.When the triggering part is not pushed by the surface mount deviceswitch, the flexible conducting element is not contacted with and pushedby the metal dome and the flexible conducting element is restored to anoriginal shape in response to the elastic force.

In accordance with another aspect of the present invention, there isprovided a touchpad module. The touchpad module includes a circuit boardand a surface mount device switch. The circuit board includes at leastone circuit board contact part. The surface mount device switch includesa pedestal, a flexible conducting element and a metal dome. The pedestalincludes a pedestal conducting part and at least one pedestal contactpart. The pedestal conducting part is electrically connected with the atleast one pedestal contact part. The at least one pedestal contact partis electrically connected with the at least one circuit board contactpart. The flexible conducting element is connected with the pedestal andelectrically connected with the at least one pedestal contact part. Theflexible conducting element is not contacted with the pedestalconducting part. When the at least one pedestal contact part iselectrically connected with the circuit board, the flexible conductingelement and the circuit board are separated from each other by a spacingdistance. The metal dome is located under the pedestal conducting partand the flexible conducting element. When the surface mount deviceswitch pushes a triggering part, the metal dome is subjected todeformation and contacted with the pedestal conducting part and theflexible conducting element, so that the pedestal conducting part andthe flexible conducting element are electrically connected with eachother. As the flexible conducting element is contacted with and pushedby the metal dome, the flexible conducting element is deformable in adirection toward the circuit board to generate an elastic force. Whenthe triggering part is not pushed by the surface mount device switch,the flexible conducting element is not contacted with and pushed by themetal dome and the flexible conducting element is restored to anoriginal shape in response to the elastic force.

In accordance with a further aspect of the present invention, there isprovided a computing device. The computing device includes a casing, aprocessor and a touchpad module. A fixing frame is concavely formed inthe casing. The processor is disposed within the casing. The touchpadmodule is disposed within the fixing frame and electrically connectedwith the processor. The touchpad module comprises a circuit board and asurface mount device switch. The circuit board includes at least onecircuit board contact part. The surface mount device switch includes apedestal, a flexible conducting element and a metal dome. The pedestalincludes a pedestal conducting part and at least one pedestal contactpart. The pedestal conducting part is electrically connected with the atleast one pedestal contact part. The at least one pedestal contact partis electrically connected with the at least one circuit board contactpart. The flexible conducting element is connected with the pedestal andelectrically connected with the at least one pedestal contact part. Theflexible conducting element is not contacted with the pedestalconducting part. When the at least one pedestal contact part iselectrically connected with the circuit board, the flexible conductingelement and the circuit board are separated from each other by a spacingdistance. The metal dome is located under the pedestal conducting partand the flexible conducting element. When the surface mount deviceswitch pushes a triggering part, the metal dome is subjected todeformation and contacted with the pedestal conducting part and theflexible conducting element, so that the pedestal conducting part andthe flexible conducting element are electrically connected with eachother. As the flexible conducting element is contacted with and pushedby the metal dome, the flexible conducting element is deformable in adirection toward the circuit board to generate an elastic force. Whenthe triggering part is not pushed by the surface mount device switch,the flexible conducting element is not contacted with and pushed by themetal dome and the flexible conducting element is restored to anoriginal shape in response to the elastic force.

The above objects and advantages of the present invention will becomemore readily apparent to those ordinarily skilled in the art afterreviewing the following detailed description and accompanying drawings,in which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically illustrates a conventional notebook computer with atouchpad module;

FIG. 2 is a schematic cross-sectional view illustrating the touchpadmodule as shown in FIG. 1, in which the touchpad module is not presseddown;

FIG. 3 is a schematic cross-sectional view illustrating the touchpadmodule as shown in FIG. 1, in which the touchpad module is pressed down;

FIG. 4 is a schematic cross-sectional view illustrating portions of acircuit board and a switch element of the touchpad module as shown inFIG. 1;

FIG. 5 is a schematic perspective view illustrating the outer appearanceof a computing device with a touchpad module according to an embodimentof the present invention;

FIG. 6 is a schematic cross-sectional view illustrating portions of afixing frame and a touchpad module of the computing device as shown inFIG. 5;

FIG. 7 is a schematic perspective view illustrating the outer appearanceof the SMD switch of the touchpad module as shown in FIG. 6;

FIG. 8 is a schematic exploded view illustrating the SMD switch of thetouchpad module as shown in FIG. 7 and taken along a viewpoint;

FIG. 9 is a schematic exploded view illustrating the SMD switch of thetouchpad module as shown in FIG. 7 and taken along another viewpoint;

FIG. 10 is a schematic cutaway view illustrating the SMD switch of thetouchpad module as shown in FIG. 7

FIG. 11 is a schematic cross-sectional view illustrating the touchpadmodule as shown in FIG. 6, in which the touchpad module is pressed down;

FIG. 12 schematically illustrates a touchpad module for a computingdevice according to another embodiment of the present invention; and

FIG. 13 is a schematic cross-sectional view illustrating a portion ofthe touchpad module as shown in FIG. 12.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 5 is a schematic perspective view illustrating the outer appearanceof a computing device with a touchpad module according to an embodimentof the present invention. An example of the computing device 4 includesbut is not limited to a notebook computer. In an embodiment, thecomputing device 4 comprises a casing 41, a display screen 42, aprocessor 45 and a touchpad module 3. The processor 45 is disposedwithin the casing 41. Moreover, the processor 45 is used for processingelectronic signals of the computing device 4. Moreover, a fixing frame44 is concavely formed in the casing 41 (see FIGS. 6 and 11). Thetouchpad module 3 is disposed within the fixing frame 44 andelectrically connected with the processor 45. In addition, at least aportion of the touchpad module 3 is exposed outside so as to be touchedby the user's finger. Consequently, the user may operate the touchpadmodule 3 to control the computing device 4. For example, in case thatthe user's finger is placed on the touchpad module 3 and slid on thetouchpad module 3, a cursor 43 shown on the display screen 42 iscorrespondingly moved. Moreover, in case that the touchpad module 3 ispressed by the user's finger, the computing device 4 executes aspecified function.

FIG. 6 is a schematic cross-sectional view illustrating portions of afixing frame and a touchpad module of the computing device as shown inFIG. 5. The fixing frame 44 of the computing device 4 comprises anaccommodation space 441. The touchpad module 3 is accommodated withinthe accommodation space 441. From top to bottom, the touchpad module 3comprises a covering plate 31, an adhesive layer 39, a circuit board 32and a surface mount device (SMD) switch 33. The covering plate 31 andthe circuit board 32 are combined together through the adhesive layer39. The SMD switch 33 is disposed on a bottom surface of the circuitboard 32 and located at a first end 34 of the touchpad module 3. Thecircuit board 32 comprises plural circuit board contact parts 321. Thecircuit board contact parts 321 are electrically connected with the SMDswitch 33. A top surface of the covering plate 31 is exposed outside.Consequently, the covering plate 31 can be touched and operated by theuser. When the circuit board 32 senses the touching and operatingbehavior of the user on the covering plate 31, the circuit board 32issues a corresponding electronic signal. According to the electronicsignal, the computing device 4 executes a corresponding command.Preferably but not exclusively, the covering plate 31 is a glasscovering plate or a plastic covering plate, and the adhesive layer 39 ismade of a pressure sensitive adhesive (PSA).

The computing device 4 further comprises a triggering part 46 and asupporting structure 47. The triggering part 46 and the supportingstructure 47 are disposed on an inner side of the fixing frame 44 andaccommodated within the accommodation space 441 of the fixing frame 44.A second end 35 of the touchpad module 3 is disposed on the supportingstructure 47. During the process of swinging the first end 34 of thetouchpad module 3, the second end 35 of the touchpad module 3 is used asa fulcrum. The triggering part 46 is aligned with the SMD switch 33.While the first end 34 of the touchpad module 3 is swung downwardly, thetriggering part 46 is contacted with the SMD switch 33. The triggeringpart 46 is a raised structure or a flat surface. In addition, thetriggering part 46 is integrally formed with the fixing frame 44.Alternatively, the triggering part 46 is one of the components withinthe fixing frame 44.

Please refer to FIGS. 7, 8, 9 and 10. FIG. 7 is a schematic perspectiveview illustrating the outer appearance of the SMD switch of the touchpadmodule as shown in FIG. 6. FIG. 8 is a schematic exploded viewillustrating the SMD switch of the touchpad module as shown in FIG. 7and taken along a viewpoint. FIG. 9 is a schematic exploded viewillustrating the SMD switch of the touchpad module as shown in FIG. 7and taken along another viewpoint. FIG. 10 is a schematic cutaway viewillustrating the SMD switch of the touchpad module as shown in FIG. 7.The SMD switch 33 comprises a pedestal 331, a metal dome 332, a flexibleconducting element 333 and a sheltering plate 334. The sheltering plate334 is located under the pedestal 331. In addition, the metal dome 332is covered between the pedestal 331 and the sheltering plate 334.Preferably but not exclusively, the sheltering plate 334 is made of aplastic material or a metallic material.

The pedestal 331 is located under the circuit board 32. The pedestal 331comprises a pedestal conducting part 3311 and plural pedestal contactparts 3313. The pedestal conducting part 3311 are located under thepedestal 331. The pedestal contact parts 3313 are located at a lateraledge of the pedestal 331. Moreover, the pedestal contact parts 3313 areelectrically connected with the circuit board contact parts 321 of thecircuit board 32 through solder paste or any other appropriateconnecting means. Consequently, electronic signals can be transferredbetween the circuit board 32 and the SMD switch 33 through the pedestalcontact parts 3313 and the circuit board contact parts 321.

The flexible conducting element 333 is connected with the pedestal 331and electrically connected with at least a portion of the pedestalcontact parts 3313. The metal dome 332 is located under the pedestalconducting part 3311 and the flexible conducting element 333. When thetouchpad module 3 is not pressed, the metal dome 332 is not contactedwith the pedestal conducting part 3311 and the flexible conductingelement 333, and the pedestal conducting part 3311 is not contacted withthe flexible conducting element 333. Meanwhile, the electric connectionbetween the pedestal conducting part 3311 and the flexible conductingelement 333 is not established (see FIG. 10). When the SMD switch 33 isdisposed on the circuit board 32, the pedestal contact parts 3313 of thepedestal 331 are contacted with the circuit board contact parts 321 ofthe circuit board 32. Meanwhile, there is a spacing distance D betweenthe flexible conducting element 333 and the circuit board 32.Consequently, when the flexible conducting element 333 from bottom totop, the flexible conducting element 333 is deformable in the directiontoward the circuit board 32. Moreover, the spacing distance D betweenthe flexible conducting element 333 and the circuit board 32 has thefunction of limiting the deformation extent of the flexible conductingelement 333. The reason will be described later. Moreover, when theflexible conducting element 333 is subjected to deformation, an elasticforce is generated. When the flexible conducting element 333 is nolonger pushed, the flexible conducting element 333 is restored to itsoriginal shape in response to the elastic force.

In an embodiment, the pedestal 331 further comprises a partition plate3314. The flexible conducting element 333 is supported by the partitionplate 3314. An opening 3317 is formed in the partition plate 3314. In anembodiment, the flexible conducting element 333 comprises a conductivecontact part 3331 and plural arm parts 3332. The two ends of each armpart 3332 are connected with the conductive contact part 3331 and thepedestal 331, respectively. The flexible conducting element 333 isexposed to the opening 3317 of the pedestal 331. The arm parts 3332 ofthe flexible conducting element 333 are accommodated within a firstpedestal space 3315 between the partition plate 3314 and the circuitboard 32. The metal dome 332 is accommodated within a second pedestalspace 3316 between the partition plate 3314 and the sheltering plate334. Preferably but not exclusively, the pedestal contact parts 3313 areelectric pads or pins.

In an embodiment, the conductive contact part 3331 and the plural armparts 3332 of the flexible conducting element 333 are made ofelectrically-conductive material (e.g., metallic material). After thearm parts 3332 of the flexible conducting element 333 are connected withthe pedestal 331, the conductive contact part 3331 are electricallyconnected with at least one pedestal contact part 3313 of the pedestal331 through conducting lines (not shown) in the arm parts 3332 and thepedestal 331.

In another embodiment, the conductive contact part 3331 and the pluralarm parts 3332 of the flexible conducting element 333 are made ofelectrically-conductive material (e.g., metallic material). In addition,conducting lines (not shown) to be connected with the conductive contactpart 3331 are formed on at least one of the plural arm parts 3332. Afterthe arm parts 3332 of the flexible conducting element 333 are connectedwith the pedestal 331, the conductive contact part 3331 are electricallyconnected with at least one pedestal contact part 3313 of the pedestal331 through the conducting lines (not shown) on the at least one armparts 3332 and the conducting lines (not shown) in the pedestal 331.

FIG. 11 is a schematic cross-sectional view illustrating the touchpadmodule as shown in FIG. 6, in which the touchpad module is pressed down.While the covering plate 31 of the touchpad module 3 is pressed down bythe user, the first end 34 of the touchpad module 3 is swung downwardlyrelative to the triggering part 46 by using the supporting structure 47as a fulcrum. When the SMD switch 33 is pushed by the triggering part46, the metal dome 332 of the SMD switch 33 is subjected to deformation.While the metal dome 332 is subjected to deformation, the portion of themetal dome 332 aligned with the pedestal conducting part 3311 iscontacted with the pedestal conducting part 3311, and the portion of themetal dome 332 aligned with the flexible conducting element 333 iscontacted with the flexible conducting element 333. Consequently, theelectric connection between the pedestal conducting part 3311 and theflexible conducting element 333 is established and the SMD switch 33 istriggered. At the same time, the circuit board 32 electrically connectedwith the SMD switch 33 issues a corresponding electronic signal to thecomputing device. According to the electronic signal, the computingdevice 4 executes a corresponding function.

While the metal dome 332 is subjected to deformation, the portion of themetal dome 332 aligned with the flexible conducting element 333 iscontacted with the conductive contact part 3331 of the flexibleconducting element 333. In addition, the portion of the metal dome 332aligned with the flexible conducting element 333 is moved upwardly topush the conductive contact part 3331. Consequently, the arm parts 3332of the flexible conducting element 333 are deformable in the directiontoward the circuit board 32. As mentioned above, there is the spacingdistance D between the flexible conducting element 333 and the circuitboard 32. During the collision between the metal dome 332 and theflexible conducting element 333, the spacing distance D provides abuffering space. Since the collision between the metal dome 332 and theflexible conducting element 333 is alleviated, the noise is reduced.Consequently, the comfort of operating the touchpad module 3 isenhanced.

Moreover, the spacing distance D between the flexible conducting element333 and the circuit board 32 may be determined according to thepractical requirements. For example, the spacing distance D between theflexible conducting element 333 and the circuit board 32 is determinedaccording to the deformable amount of the metal dome 332. Consequently,while the flexible conducting element 333 is pushed by the metal dome332, the flexible conducting element 333 is not subjected to excessivedeformation. In other words, the tactile feel of the user to press thetouchpad module 3 is not adversely affected. Preferably but notexclusively, the conductive contact part 3331 of the flexible conductingelement 333 has a hollow region 3333. That is, the conductive contactpart 3331 is a hollow structure. Consequently, the collision between themetal dome 332 and the flexible conducting element 333 is furtheralleviated, and the noise is largely reduced.

When the touchpad module 3 is no longer pressed by the user, the firstend 34 of the touchpad module 3 is swung upwardly relative to thetriggering part 46 in response to the elastic force of the metal dome332 and/or the elastic force of the supporting structure 47.Consequently, the metal dome 332 is restored to its original shape.Since the conductive contact part 3331 of the flexible conductingelement 333 is no longer pushed by the metal dome 332, the conductivecontact part 3331 of the flexible conducting element 333 is returned toits original position (see FIG. 10).

In the above embodiment, the portion of the metal dome 332perpendicularly aligned with the pedestal conducting part 3311 is notcontacted with the pedestal conducting part 3311 when the touchpadmodule 3 is not pressed down. It is noted that numerous modificationsand alterations may be made while retaining the teachings of theinvention. For example, in another embodiment, the portion of the metaldome 332 perpendicularly aligned with the pedestal conducting part 3311is contacted with the pedestal conducting part 3311 when the touchpadmodule 3 is not pressed down.

It is noted that numerous modifications and alterations may be madewhile retaining the teachings of the invention. For example, in anotherembodiment, the touchpad module is an external input device that isindependent from the electronic computing device. Please refer to FIGS.12 and 13. FIG. 12 schematically illustrates a touchpad module for acomputing device according to another embodiment of the presentinvention. FIG. 13 is a schematic cross-sectional view illustrating aportion of the touchpad module as shown in FIG. 12. The structures andfunctions of the components of the touchpad module 3′ which areidentical to those of the above embodiments are not redundantlydescribed herein. The touchpad module 3′ further comprises a triggeringpart 37, a supporting structure 38 and a fixing frame 36. The coveringplate 31, the adhesive layer 39, the circuit board 32 and the SMD switch33 are accommodated within the fixing frame 36. The triggering part 37is a raised structure or a flat surface. In addition, the triggeringpart 37 is integrally formed with the fixing frame 36. Alternatively,the triggering part 37 is one of the components within the fixing frame36. The touchpad module 3′ is in communication with a desktop computer 6through a universal serial bus (USB) 5.

While the invention has been described in terms of what is presentlyconsidered to be the most practical and preferred embodiments, it is tobe understood that the invention needs not be limited to the disclosedembodiments. On the contrary, it is intended to cover variousmodifications and similar arrangements included within the spirit andscope of the appended claims which are to be accorded with the broadestinterpretation so as to encompass all such modifications and similarstructures.

What is claimed is:
 1. A surface mount device switch for a touchpadmodule with a circuit board, the surface mount device switch comprising:a pedestal comprising a pedestal conducting part and at least onepedestal contact part, wherein the pedestal conducting part iselectrically connected with the at least one pedestal contact part, andthe at least one pedestal contact part is electrically connected withthe circuit board; a flexible conducting element connected with thepedestal and electrically connected with the at least one pedestalcontact part, wherein the flexible conducting element is not contactedwith the pedestal conducting part, wherein when the at least onepedestal contact part is electrically connected with the circuit board,the flexible conducting element and the circuit board are separated fromeach other by a spacing distance; and a metal dome located under thepedestal conducting part and the flexible conducting element, whereinwhen the surface mount device switch pushes a triggering part, the metaldome is subjected to deformation and contacted with the pedestalconducting part and the flexible conducting element, so that thepedestal conducting part and the flexible conducting element areelectrically connected with each other, wherein as the flexibleconducting element is contacted with and pushed by the metal dome, theflexible conducting element is deformable in a direction toward thecircuit board to generate an elastic force, wherein when the triggeringpart is not pushed by the surface mount device switch, the flexibleconducting element is not contacted with and pushed by the metal domeand the flexible conducting element is restored to an original shape inresponse to the elastic force.
 2. The surface mount device switchaccording to claim 1, wherein the flexible conducting element comprisesa conductive contact part and an arm part, wherein a first end of thearm part is connected with the conductive contact part, and a second endof the arm part is connected with the pedestal, wherein the pedestalfurther comprises an opening, and the conductive contact part isdisposed within the opening, wherein after the metal dome is subjectedto deformation, the metal dome is contacted with the conductive contactpart through the opening.
 3. The surface mount device switch accordingto claim 2, wherein the pedestal further comprises a partition plate,and the opening is formed in the partition plate, wherein the flexibleconducting element is supported by the partition plate.
 4. The surfacemount device switch according to claim 3, wherein at least a portion ofthe flexible conducting element is accommodated within a first pedestalspace between the circuit board and the partition plate.
 5. The surfacemount device switch according to claim 1, wherein the surface mountdevice switch further comprises a sheltering plate, wherein thesheltering plate is located under the pedestal, and the metal dome iscovered between the pedestal and the sheltering plate.
 6. The surfacemount device switch according to claim 5, wherein the pedestal furthercomprises a partition plate, and the metal dome is accommodated within asecond pedestal space between the sheltering plate and the partitionplate.
 7. The surface mount device switch according to claim 1, whereinthe at least one pedestal contact part includes at least one electricpad or at least one pin.
 8. A touchpad module, comprising: a circuitboard comprising at least one circuit board contact part; and a surfacemount device switch comprising: a pedestal comprising a pedestalconducting part and at least one pedestal contact part, wherein thepedestal conducting part is electrically connected with the at least onepedestal contact part, and the at least one pedestal contact part iselectrically connected with the at least one circuit board contact part;a flexible conducting element connected with the pedestal andelectrically connected with the at least one pedestal contact part,wherein the flexible conducting element is not contacted with thepedestal conducting part, wherein when the at least one pedestal contactpart is electrically connected with the at least one circuit boardcontact part, the flexible conducting element and the circuit board areseparated from each other by a spacing distance; and a metal domelocated under the pedestal conducting part and the flexible conductingelement, wherein when the surface mount device switch pushes atriggering part, the metal dome is subjected to deformation andcontacted with the pedestal conducting part and the flexible conductingelement, so that the pedestal conducting part and the flexibleconducting element are electrically connected with each other, whereinas the flexible conducting element is contacted with and pushed by themetal dome, the flexible conducting element is deformable in a directiontoward the circuit board to generate an elastic force, wherein when thetriggering part is not pushed by the surface mount device switch, theflexible conducting element is not contacted with and pushed by themetal dome and the flexible conducting element is restored to anoriginal shape in response to the elastic force.
 9. The touchpad moduleaccording to claim 8, wherein the touchpad module further comprises acovering plate, and the covering plate is located over the circuitboard.
 10. The touchpad module according to claim 9, wherein thecovering plate is a glass covering plate or a plastic covering plate,and the covering plate and the circuit board are combined togetherthrough an adhesive layer.
 11. The touchpad module according to claim 8,wherein the surface mount device switch further comprises a shelteringplate, wherein the sheltering plate is located under the pedestal, andthe metal dome is covered between the pedestal and the sheltering plate.12. The touchpad module according to claim 8, wherein the circuit boardand the surface mount device switch are accommodated within a fixingframe, and the triggering part is disposed on an inner surface of thefixing frame so as to be pushed by the surface mount device switch. 13.The touchpad module according to claim 12, wherein the fixing frame isincluded in a computing device, or the touchpad module further comprisesthe fixing frame.
 14. The touchpad module according to claim 8, whereinthe flexible conducting element comprises a conductive contact part andan arm part, wherein a first end of the arm part is connected with theconductive contact part, and a second end of the arm part is connectedwith the pedestal, wherein the pedestal further comprises an opening,and the conductive contact part is disposed within the opening, whereinafter the metal dome is subjected to deformation, the metal dome iscontacted with the conductive contact part through the opening.
 15. Thetouchpad module according to claim 14, wherein the pedestal furthercomprises a partition plate, and the opening is formed in the partitionplate, wherein the flexible conducting element is supported by thepartition plate.
 16. A computing device, comprising: a casing, wherein afixing frame is concavely formed in the casing; a processor disposedwithin the casing; and a touchpad module disposed within the fixingframe and electrically connected with the processor, wherein thetouchpad module comprises a circuit board and a surface mount deviceswitch, wherein the circuit board comprises at least one circuit boardcontact part, and the surface mount device switch comprises: a pedestalcomprising a pedestal conducting part and at least one pedestal contactpart, wherein the pedestal conducting part is electrically connectedwith the at least one pedestal contact part, and the at least onepedestal contact part is electrically connected with the at least onecircuit board contact part; a flexible conducting element connected withthe pedestal and electrically connected with the at least one pedestalcontact part, wherein the flexible conducting element is not contactedwith the pedestal conducting part, wherein when the at least onepedestal contact part is electrically connected with the at least onecircuit board contact part, the flexible conducting element and thecircuit board are separated from each other by a spacing distance; and ametal dome located under the pedestal conducting part and the flexibleconducting element, wherein when the surface mount device switch pushesa triggering part, the metal dome is subjected to deformation andcontacted with the pedestal conducting part and the flexible conductingelement, so that the pedestal conducting part and the flexibleconducting element are electrically connected with each other, whereinas the flexible conducting element is contacted with and pushed by themetal dome, the flexible conducting element is deformable in a directiontoward the circuit board to generate an elastic force, wherein when thetriggering part is not pushed by the surface mount device switch, theflexible conducting element is not contacted with and pushed by themetal dome and the flexible conducting element is restored to anoriginal shape in response to the elastic force.
 17. The computingdevice according to claim 16, wherein the touchpad module furthercomprises a covering plate, and the covering plate is located over thecircuit board.
 18. The computing device according to claim 16, whereinthe surface mount device switch further comprises a sheltering plate,wherein the sheltering plate is located under the pedestal, is coveredbetween the pedestal and the sheltering plate.
 19. The computing deviceaccording to claim 16, wherein the fixing frame comprises anaccommodation space and the triggering part, wherein the triggering partis disposed on an inner surface of the fixing frame, and the circuitboard and the surface mount device switch are accommodated within theaccommodation space.
 20. The computing device according to claim 16,wherein the flexible conducting element comprises a conductive contactpart and an arm part, wherein a first end of the arm part is connectedwith the conductive contact part, and a second end of the arm part isconnected with the pedestal, wherein the pedestal further comprises anopening, and the conductive contact part is disposed within the opening,wherein after the metal dome is subjected to deformation, the metal domeis contacted with the conductive contact part through the opening.